/**
 * Copyright 1996 self.com.au
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. (http://www.apache.org/licenses/LICENSE-2.0)
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed 
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for 
 * the specific language governing permissions and limitations under the License.
 *
 * <dhamma-message src="Atisha (11th century Tibetan Buddhist master)">
 * 	The greatest achievement is selflessness. The greatest worth is self-mastery.
 * 	The greatest quality is seeking to serve others. The greatest precept is continual awareness.
 * 	The greatest medicine is the emptiness of everything. The greatest action is not conforming with the worlds ways.
 * 	The greatest magic is transmuting the passions. The greatest generosity is non-attachment.
 * 	The greatest goodness is a peaceful mind. The greatest patience is humility.
 * 	The greatest effort is not concerned with results. The greatest meditation is a mind that lets go.
 * 	The greatest wisdom is seeing through appearances. 
 * </dhamma-message>
 *
 * @author Ashin Wimalajeewa
 *
 * Note, this is a very old runtime library that I have evolved since 1996. I rarely use it
 * now because the Apache Commons project has made it obsolete.
 */
package self.awt;

import java.io.*;
import java.awt.*;
import java.awt.datatransfer.*;

final public class ClipboardUtils {
  private ClipboardUtils() {
	// nothing to do.
  }
  
  static public String getTextFromClipboard() {
    Clipboard brd = Toolkit.getDefaultToolkit().getSystemClipboard();
    Transferable t = brd.getContents( ClipboardUtils.class );
    
    String data = null;
    try {
      data = (String)t.getTransferData( DataFlavor.stringFlavor );
    } catch ( Exception err ) {
      err.printStackTrace();
      throw new IllegalStateException( err.getMessage() );
    }
    return data;
  }
 
  static public void saveTextToClipboard( String data ) {
    Clipboard brd = Toolkit.getDefaultToolkit().getSystemClipboard();
    StringSelection sel = new StringSelection( data );
    brd.setContents( sel, sel );
  } 
  
  static public Reader createClipboardReader() {
    String data = ClipboardUtils.getTextFromClipboard();
    return new StringReader( data );
  }
  
  static public Writer createClipboardWriter() {
    return new ClipboardWriter();
  }
  
  static public boolean isContentAvailable() {
    Clipboard brd = Toolkit.getDefaultToolkit().getSystemClipboard();
    return brd.getContents(ClipboardUtils.class) != null;
  }
}

class ClipboardWriter extends Writer {
  private StringBuffer buff = new StringBuffer();
  public void write(char cbuf[], int off, int len) throws IOException {
    buff.append( cbuf, off, len );
  }
  
  public void flush() throws IOException {
    if ( buff.length() == 0 )
      return;
    String dump = buff.toString();
    ClipboardUtils.saveTextToClipboard( dump );  
    buff.setLength( 0 );
  }
  
  public void close() throws IOException {
    flush();
  }
}